AES 128 用CBC 加密
整了很长时间才好，网上参考材料很少
参考 ：
//Ase加密
https://www.jianshu.com/p/9a348bdf9ce1
//十六进制字符串与NSData的转化
https://www.jianshu.com/p/2e68a91d4681
导入框架 #import <CommonCrypto/CommonCryptor.h>
最近在完成一个需求时，遇到了NSData类型转换为十六进制的字符串这个需求的函数，
.h文件
//加密
- (NSData*)AES128EncryptWithKey:(NSString*)key iv:(NSString*)iv;
//解密
- (NSData*)AES128DecryptWithKey:(NSString*)key iv:(NSString*)iv;
.m文件
//://加密
- (NSData*)AES128EncryptWithKey:(NSString*)key iv:(NSString*)iv
{
return [self AES128operation:kCCEncrypt key:key iv:iv];
}
//解密
- (NSData*)AES128DecryptWithKey:(NSString*)key iv:(NSString*)iv
{
return [self AES128operation:kCCDecrypt key:key iv:iv];
}
- (NSData*)AES128operation:(CCOperation)operation key:(NSString*)key iv:(NSString*)iv
{
charkeyPtr[kCCKeySizeAES128+1];
bzero(keyPtr,sizeof(keyPtr));
[keygetCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
// IV
char ivPtr[kCCBlockSizeAES128 + 1];
bzero(ivPtr,sizeof(ivPtr));
[ivgetCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];
size_tbufferSize = [selflength] +kCCBlockSizeAES128;
void*buffer =malloc(bufferSize);
size_tnumBytesEncrypted =0;
CCCryptorStatus cryptorStatus = CCCrypt(operation, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
keyPtr,kCCKeySizeAES128,
ivPtr,
[selfbytes], [selflength],
buffer, bufferSize,
&numBytesEncrypted);
if(cryptorStatus ==kCCSuccess){
NSLog(@"Success");
return[NSDatadataWithBytesNoCopy:bufferlength:numBytesEncrypted];
}else{
NSLog(@"Error");
}
free(buffer);
return nil;
}
十六进制字符串与NSData的转化
- (NSString*)convertDataToHexStr:(NSData*)data {
if(!data || [data length] ==0) {
return@"";
}
NSMutableString*string = [[NSMutableStringalloc] initWithCapacity:[data length]];
[data enumerateByteRangesUsingBlock:^(constvoid*bytes,NSRangebyteRange,BOOL*stop) {
unsignedchar*dataBytes = (unsignedchar*)bytes;f
or(NSIntegeri =0; i < byteRange.length; i++) {
NSString*hexStr = [NSStringstringWithFormat:@"%x", (dataBytes[i]) &0xff];
if([hexStr length] ==2) {
[string appendString:hexStr];
}else{
[string appendFormat:@"0%@", hexStr];
}
}
}
];
return string;}
